Hello, I live in a historic 1890's home in Canada and want to replace my clawfoot tub faucet with one that has a hand shower. It's in perfect order, not even a small leak and it looks great the manufacturer says Mueller so 1908-1920 maybe? The centers are 3 3/8. I've seen one on http://www.vintagetub.com asp/product_detail.asp?item_no=P0154QN that I like but I don't understand the whole supply line recommendation? Could it be that this new faucet will not fit with my old pipes as far as diameter is concerned? Thank you for any info you can provide.